246 



Physics of the Soil. 



can be handled with equal facility, there is an evident ad- 

 vantage in riding plows such as Fig. 80. 



FIG. SO. Sulky or riding plow. 



308. The Line of Draft. It is very important in the 

 handling of a plow that the line of draft be just right and 

 such that a line connecting the center of draft A, Fig. 81, 

 in the mold board with the place of attachment to the plow 

 bridle shall also lie in the plane of the traces, as shown in 



FIG. 81. Direction of the Mne of draft for plows. 



